vagrant 好像不能拉取公共镜像？

$ cat Vagrantfile
Vagrant.configure("2") do |config|
config.vm.box = "debian/stretch64"
end
$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'debian/stretch64' could not be found. Attempting to find and install...
default: Box Provider: virtualbox
default: Box Version: >= 0
The box 'debian/stretch64' could not be found or
could not be accessed in the remote catalog. If this is a private
box on HashiCorp's Atlas, please verify you're logged in via
`vagrant login`. Also, please double-check the name. The expanded
URL and error message are shown below:
URL: ["https://atlas.hashicorp.com/debian/stretch64"]
Error: The requested URL returned error: 404 Not Found